Why yes you DO!!!!


Again this is absolutely positively why you DO NOT want to use yellow brass below water. The 85-5-5-5 BRONZE seacock (85% copper, 5% tin, 5% lead & 5% zinc) this was attached to was PERFECTLY FINE.


This yellow brass nipple (60% copper & 40% zinc) had dezincified & wasted away to the point where it was leaking badly.. The threads literally looked like they were melting away, and they WERE...


GROCO makes BRONZE pipe nipples, USE THEM, if you need a nipple... Please don't fall prey to Home Depot yellow brass for your below waterline fittings!